Research Overview

I work on visual information processing in humans and am concerned particularly with the question of how
psychological processes depend upon underlying physiological mechanisms. The major research tool is the analysis
of brain-evoked potentials and magnetic signals recorded from human subjects while they are performing specified
tasks. Extensive use is made of computers to collect and analyze data. By using multivariate statistical analyses,
relationships have been established between certain components of the brain's electrical and magnetic responses and
characteristics of information processing operations such as stimulus relevance, expectancy, memory storage, and
semantic meaning. We are currently studying these in aging and Alzheimer's disease.